Question

slove equations and put it into a matrices
4t-5r=21
3t-7r=18

Answer 1

4t - 5r = 21 (multiply all by 7)
3t - 7r = 18 (multiply all by -5)

28t - 35r = 147
-15t + 35r = 90

add the two equations together

13t =237

t = 18.230769230769230769230769230769

4(18.230769230769230769230769230769) - 5r = 21
72.923076923076923076923076923077 - 5r = 21
72.923076923076923076923076923077 - 21 = 5r
51.923076923076923076923076923077 = 5r

10.384615384615384615384615384615 = r


not sure if this is right

Answer 2

i got the answer of t=57/13
and r=-9/13
but i have to put it into a matrices

Answer 3

lol damn i had it right the first time

Answer 4

let me write it out again

Answer 5

ok but i dont know how to put it into a matrix

Answer 6

4t - 5r = 21
3t - 7r = 18

4t = 21 + 5r
divide everything by 4

t = 5.25 + 1.25r

3(5.25 + 1.25r) - 7r = 18

15.75 + 3.75r - 7r = 18

15.75 - 18 = 7r - 3.75r
-2.25 = 3.25r

-2.25 / 3.25 = 3.25r / 3.25

-9/13 = r

4t - 5(-9/13) = 21
4t + 45/13 = 21

4t = 21 - 45/13
4t = 228/13
4t / 4 = (228/13)/4

t = 57/13

Answer 7

ok let me work out how to put into matrix

Answer 8

ok i got all that i just dont no how to make a matrix out of that

Answer 9

no idea with matrixes going to have to ask someone else sorry

Answer 10

im out of here bye