Question

-5x + 7y = 18 y = 4

Answer 1

Plug in 4 for y and your equation is
\[-5x + 7(4) = 18\]
Multiply 7 and 4
\[-5x + 28 = 18\]
To get the x term by itself (-5x), you subtract 28 from both sides
\[-5x + 0= 18-28\]
\[-5x=-10\]
Since -5 is multiplied by x, you will divide by -5 on both sides to get x by itself
\[x=\frac{ -10 }{ -5 }\]
The negatives cancel and you get
\[x=2\]