Question

solve the simultaneous equations:
4x+7y=1
3x+10y=15

Answer 1

you would multiply the 4x and equation by 3 and the 3x and equation by -4
so then you would have 12x +21y=3 and -12x-40y=-60
so then the x variables would cancel out and you would combine everything else to get -19y=-57 and then you would divide by -19 and you would get y=3 and then you would plug that back into one of the equations to find x so
3x+10(3)=15 -plug in y
3x+30= 15 - multiply
3x + 30-30=15-30 -subtract 30 to isolate the variable
3x= 15 - divide by 3
x=5 and y= 3

Answer 2

this is a wrong answer

Answer 3

u can check whether the answer is right or wrong
by substituting x=5 and y=3 in equation 2

Answer 4

so lets do it
3x+10y=15
3(5)+10(3)=15
15+30=15
45=15
so its wrong answer