You will have to use the PEMDAS rule here. so Parntheses goes first, then exponents, then mutiplicaton or division, and finally addition or subtraction.
Y = -10x + 1...slope here is -10. A perpendicular line will have a negative reciprocal slope. To find the negative reciprocal of a number, flip the number and change the sign. So our perpendicular line will need a slope of 1/10.
y = mx + b slope(m) = 1/10 (5,7)....x = 5 and y = 7 now sub and find b, the y int 7 = 1/10(5) + b 7 = 1/2 + b 7 - 1/2 = b 14/2 - 1/2 = b 13/2 = b
so ur perpendicular line going thru (5,7) is y = 1/10x + 13/2
