BOOST for people having a hard time in math what's y'all math grade ? or who doesn't have enough points to answer question .

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?